The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 1,2-Bis(diphenylphosphino)ethane( cas:1663-45-2 ) is researched.Electric Literature of C26H24P2.Boelter, Scott D.; Davies, Dan R.; Margl, Peter; Milbrandt, Kara A.; Mort, Darrek; Vanchura, Britt A.; Wilson, David R.; Wiltzius, Molly; Rosen, Mari S.; Klosin, Jerzy published the article 《Phospholane-Based Ligands for Chromium-Catalyzed Ethylene Tri- and Tetramerization》 about this compound( cas:1663-45-2 ) in Organometallics. Keywords: diphosphine chromium complex preparation structure oligomerization catalyst; oligomerization ethylene preparation hexene octene chromium diphosphine catalyst screening. Let’s learn more about this compound (cas:1663-45-2).
Chromium trichloride and tetracarbonyl diphosphine complexes were prepared and evaluated as catalysts for ethylene oligomerization. Chromium complexes with bis(phospholane) ligands were synthesized and evaluated for ethylene tetramerization in a high-throughput reactor. Three ligand parameters-the phospholane substituent, the ligand backbone, and the type of phosphine (cyclic vs. acyclic) – were investigated. The size of the phospholane substituent was found to impact the selectivity of the resulting catalysts, with smaller substituents leading to the production of larger proportions of 1-octene. Changing the ligand backbone from 1,2-phenylene to ethylene did not impact catalysis, but the use of acyclic phosphines in place of the cyclic phospholanes had a detrimental effect on catalytic activity. Selected phospholane-chromium complexes were evaluated in a 300 mL Parr reactor at 70°C and 700 psi of ethylene pressure and the ethylene oligomerization performance was consistent with that observed in the smaller, high-throughput reactor. MeDuPhos-CrCl3(THF) gave activity and selectivity for 1-octene (54.8 wt %) similar to the state-of-the-art i-PrPNP-CrCl3(THF) (64.0 wt %), while EtDuPhos-CrCl3(THF) exhibited even higher activity, with catalyst selectivity shifted toward 1-hexene production (90 wt %). These results are surprising given the prevalence of the aryl phosphine motif in ligands used in ethylene oligomerization catalysts and the inferior performance of previously reported catalysts with alkyl phosphine-containing ligands.
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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis